refactor: wip migrate ot nestjs

packages/server-nest/src/utils/flat-to-nested-array.ts

@@ -0,0 +1,24 @@
+export const flatToNestedArray = (
+  data,
+  config = { id: 'id', parentId: 'parent_id' },
+) => {
+  const map = {};
+  const nestedArray = [];
+
+  data.forEach((item) => {
+    map[item[config.id]] = item;
+    map[item[config.id]].children = [];
+  });
+
+  data.forEach((item) => {
+    const parentItemId = item[config.parentId];
+
+    if (!item[config.parentId]) {
+      nestedArray.push(item);
+    }
+    if (parentItemId) {
+      map[parentItemId].children.push(item);
+    }
+  });
+  return nestedArray;
+};